[OpenAFS] screen loses tokens - Solaris 10

[Jeff Blaine]

How might I go about debugging this?  This happens
on a host with Generic_142900-03 but not on a host
with Generic_144488-17 (nor ever on this latter host
at any patch rev -- I have been using/resuming screen
on it for years).

1. Connect to host with PuTTY
2. Confirm krb5 creds and tokens gotten from PAM
3. Start screen
4. Confirm krb5 creds and tokens in screen shell
5. Close PuTTY, "Yes, disconnect"
6. Connect to host with PuTTY
7. Confirm krb5 creds and tokens gotten from PAM
8. Resume screen session
9. Tokens and krb5 creds in screen shell are gone

Common
------
OpenAFS 1.4.14
MIT Kerberos 1.6.3
Screen 4.00.02
sshd_config
pam.conf
pam_afs_session
pam_krb5RA (Russ Alberry's)
No kdestroy in shell dot files

Different
---------
SunOS faron.our.org 5.10 Generic_142900-03 sun4u sparc SUNW,Sun-Fire-V490

SunOS cairo.our.org 5.10 Generic_144488-17 sun4u sparc SUNW,Sun-Fire-280R